full-disclosure - ASHX, ASMX or What?

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Message-ID: <4E04B84D.8010001@bonsai-sec.com>
Date: Fri, 24 Jun 2011 13:16:13 -0300
From: Nahuel Grisolia <nahuel@...sai-sec.com>
To: full-disclosure@...ts.grok.org.uk, owasp-argentina@...ts.owasp.org
Subject: ASHX, ASMX or What?

List,

Imagine that you're in front of an """"insecure"""" file upload in the
context of an IIS6,7 (no ;.jpg :P) and the regex filtering the file is like:

[anything].asp[anything] (yeah, my.aspirator.jpg is filtered hehe)

No .aspx, no .asp and no .aspx;jpg even if the server is vulnerable...

So... is there any way to bypass this control? Like uploading a
malicious Webservice (can we simply upload a Webservice file? I think
they need to be precomplied first) or something like that?

Thanks a lot!

regards,
-- 
Nahuel Grisolia - C|EH
Information Security Consultant
Bonsai Information Security Project Leader
http://www.bonsai-sec.com/
(+54-11) 4777-3107

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